b) P(49 < x < 78) in a normally distributed set of data with a mean of 62 and a standard deviation of 9.

c) The amount of annual snowfall in a certain mountain range is normally distributed with a mean of 109 inches, and a standard deviation of 10 inches. If 40 snowfall amounts are randomly selected, find u x-bar for the sampling distribution of sample means with samples of size 40.

d) For drivers in the 20-24 age bracket, there is a 34% rate of car accidents in one year (based on data from the National Safety Council.) An insurance investigator finds that in a group of 500 randomly selected drivers aged 20-24 living in New York City, 40% had accidents in the last year. If the 34% rate is correct, estimate the probability that in a group of 500 randomly selected drivers, at least 40% had accidents in the last year. Based on that result, is there strong evidence supporting the claim that the accident rate in New York City is higher than 34%?

Solution Summary

Detailed solutions to all the four questions are provided.

5 Statistics Questions. ... The answer is C, because the probability that a team wins in four games is 0.0958 which is ... For Question 1 X 0 1 2 3 4 5 6 7 P(X) 0 0.003 ...

... 3 P(3)= 0.2176 or 21.76% 4 P(4)= 0.1414 or ... Answers Multiple Choice questions on Probability Distributions. Question 1 Multiple Choice Fifty-three percent of the ...

... number of questions answered correctly is 5.2 with a standard deviation of 1.9 questions. Solution- Question 1. ... x P(x) 0 0.139 1 0.325 2 0.316 3 0.164 4 0.048 5 ...

Probability Questions. ... a conference, what is the likelihood three of the four are women? ...Probability that a student drives, P(D) = 0.6 or 60% Probability that a ...

Statistical Analysis and Probability Sample Questions. ... 6. In each of the four examples listed below, one of the given variables is independent (x) and ...

... each student is instructed to choose four questions to answer, how many different four-question exams can ... Find the probability of getting 12 baby girls b ...

...questions answered correctly is 5.4 with a standard deviation of 1.7 questions. Solution- Question 8. ... Histogram (b) has the number of trials n = 4 Histogram (c ...

... The questions are multiple choice on finance issues. ... 8. In developing the pro forma income statement we follow four important steps: - 1) compute other ...

... correct: P(x=0)=4C0*0.2^0*(1-0.2)^4=0.8^4=0.4096 - The probability that a student will get more than 2 questions correct: P(x>2)=P(x=3)+P(x=4)=0.0272. #11. ...